Significant differences in T cell receptor repertoires in lung adenocarcinomas with and without epidermal growth factor receptor mutations

Eisaku Miyauchi, Tatsuo Matsuda, Kazuma Kiyotani, Siew Kee Low, Yu Wen Hsu, Yoko Tsukita, Masakazu Ichinose, Akira Sakurada, Yoshinori Okada, Ryoko Saito, Yusuke Nakamura

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

Recent clinical trials of non-small cell lung cancer with immune checkpoint inhibitors revealed that patients with epidermal growth factor receptor (EGFR) mutations had more unfavorable outcomes compared with those with wild-type EGFR. However, the underlying mechanism for the link between EGFR mutations and immune resistance remains unclear. We performed T cell receptor (TCR) repertoire analysis of resected lung adenocarcinoma tissues with and without EGFR mutations to investigate the characteristics of TCR repertoires. We collected a total of 39 paired (normal and tumor) lung tissue samples (20 had EGFR mutations) and conducted TCR repertoire analysis as well as whole-exome sequencing (WES) and transcriptome analysis. The TCR diversity index in EGFR-mutant tumors was significantly higher than that in EGFR-wild-type tumors (median [range] 552 [162-1,135] vs 230 [30-764]; P <.01), suggesting higher T cell clonal expansion in EGFR-wild-type tumors than in EGFR-mutant tumors. In WES, EGFR-mutant tumors showed lower numbers of non-synonymous mutations and predicted neoantigens than EGFR-wild-type tumors (P <.01, P =.03, respectively). The number of non-synonymous mutations revealed a positive correlation with the sum of frequencies of the TCRβ clonotypes of 1% or higher in tumors (r =.52, P =.04). The present study demonstrates significant differences in TCR repertoires and the number of predicted neoantigens between EGFR-mutant and wild-type lung tumors. Our findings provide important information for understanding the molecular mechanism behind EGFR-mutant patients showing unfavorable responses to immune checkpoint inhibitors.

Original languageEnglish
Pages (from-to)867-874
Number of pages8
JournalCancer science
Volume110
Issue number3
DOIs
Publication statusPublished - 2019 Mar

Keywords

  • EGFR mutation
  • T cell receptor repertoire
  • lung adenocarcinoma
  • neoantigen
  • non-synonymous mutation

ASJC Scopus subject areas

  • Oncology
  • Cancer Research

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